Preparation method of nano oxide dispersion strengthened steel

• Main Authors: TIAN HAICHENG, YI GUOQIANG, ZHOU YAJU, YAN YOUWEI, YIN SHENGMING
• Format: Patent
• Language: Chinese; English
• Published: 26.04.2022
• Subjects: ADDITIVE MANUFACTURING TECHNOLOGY; ADDITIVE MANUFACTURING, i.e. MANUFACTURING OFTHREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVEAGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING,STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING; ALLOYS; CASTING; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; MAKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; METALLURGY; PERFORMING OPERATIONS; POWDER METALLURGY; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS; WORKING METALLIC POWDER

The invention belongs to the field of metal structure materials, and particularly relates to a preparation method of nano oxide dispersion strengthened steel. The method comprises the following steps: mixing ferrochrome, ferrotungsten, ferroalloy containing rare earth elements, an oxygen source and reduced iron powder to obtain a mixture; wrapping the mixture in a steel belt, and performing drawing diameter reduction to obtain a flux-cored wire; and after the flux-cored wire is subjected to electric arc additive manufacturing on a substrate, heat treatment is conducted, and the nano oxide particle dispersion strengthened steel is obtained. By means of the good compatibility between the iron alloys and the smelting characteristic that an electric arc additive small molten pool is rapidly cooled and solidified, loss of rare earth elements in the additive process is reduced, segregation of the rare earth elements in the grain boundary and formation of intermetallic compounds are avoided, supersaturated solid sol